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This CL relands the test portion (web_tests/*) of r1979258, and removes
external/wpt/css/compositing from W3CImportExpectations.

It is marked as No-Export because the tests were successfully upstreamed
to WPT and are not deleted (this is the expected behaviour;
W3CImportExpectations does not affect upstream):
https://github.com/web-platform-tests/wpt/commit/4209d7961bab7dce31baab0918fa9f6dcd74bd8d

No-Export: True
Bug: 1044405
Change-Id: Ie59c35118de96256816fa35f20aca1c10f5759b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013476
Auto-Submit: Robert Ma <robertma@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734045}